Brilliant Illumination of the Lamp of the Five Stages - Practical Instructions in the King of Tantras - The Glorious Esoteric Community — by Tsongkhapa

The present work is the cornerstone of a Treasury of the Buddhist Sciences series. It is Tsongkhapa's most important commentary on the perfection stage practices of the Guhyasamaja - the Tantra he considered fundamental.

Path and Grounds of Guhyasamaja According to Arya Nagarjuna — by Yangchen Gawai Lodoe

This work by an eminent 18th century scholar is a brief but lucid and highly acclaimed treatise. It maps out the two stages of Guhyasamaja - 'king' of Highest Yoga Tantras. The work is presented here with a commentary by Geshe Lobsang Tsephel.